4 * Copyright (C) 2012, 2013 Renesas Solutions Corp.
5 * Copyright (C) 2014 Glider bvba
8 * Copyright (C) 2011 Renesas Solutions Corp.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/sched.h>
28 #include <linux/errno.h>
29 #include <linux/interrupt.h>
30 #include <linux/platform_device.h>
32 #include <linux/clk.h>
33 #include <linux/dmaengine.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/of_device.h>
36 #include <linux/pm_runtime.h>
37 #include <linux/sh_dma.h>
38 #include <linux/spi/spi.h>
39 #include <linux/spi/rspi.h>
41 #define RSPI_SPCR 0x00 /* Control Register */
42 #define RSPI_SSLP 0x01 /* Slave Select Polarity Register */
43 #define RSPI_SPPCR 0x02 /* Pin Control Register */
44 #define RSPI_SPSR 0x03 /* Status Register */
45 #define RSPI_SPDR 0x04 /* Data Register */
46 #define RSPI_SPSCR 0x08 /* Sequence Control Register */
47 #define RSPI_SPSSR 0x09 /* Sequence Status Register */
48 #define RSPI_SPBR 0x0a /* Bit Rate Register */
49 #define RSPI_SPDCR 0x0b /* Data Control Register */
50 #define RSPI_SPCKD 0x0c /* Clock Delay Register */
51 #define RSPI_SSLND 0x0d /* Slave Select Negation Delay Register */
52 #define RSPI_SPND 0x0e /* Next-Access Delay Register */
53 #define RSPI_SPCR2 0x0f /* Control Register 2 (SH only) */
54 #define RSPI_SPCMD0 0x10 /* Command Register 0 */
55 #define RSPI_SPCMD1 0x12 /* Command Register 1 */
56 #define RSPI_SPCMD2 0x14 /* Command Register 2 */
57 #define RSPI_SPCMD3 0x16 /* Command Register 3 */
58 #define RSPI_SPCMD4 0x18 /* Command Register 4 */
59 #define RSPI_SPCMD5 0x1a /* Command Register 5 */
60 #define RSPI_SPCMD6 0x1c /* Command Register 6 */
61 #define RSPI_SPCMD7 0x1e /* Command Register 7 */
62 #define RSPI_SPCMD(i) (RSPI_SPCMD0 + (i) * 2)
63 #define RSPI_NUM_SPCMD 8
64 #define RSPI_RZ_NUM_SPCMD 4
65 #define QSPI_NUM_SPCMD 4
68 #define RSPI_SPBFCR 0x20 /* Buffer Control Register */
69 #define RSPI_SPBFDR 0x22 /* Buffer Data Count Setting Register */
72 #define QSPI_SPBFCR 0x18 /* Buffer Control Register */
73 #define QSPI_SPBDCR 0x1a /* Buffer Data Count Register */
74 #define QSPI_SPBMUL0 0x1c /* Transfer Data Length Multiplier Setting Register 0 */
75 #define QSPI_SPBMUL1 0x20 /* Transfer Data Length Multiplier Setting Register 1 */
76 #define QSPI_SPBMUL2 0x24 /* Transfer Data Length Multiplier Setting Register 2 */
77 #define QSPI_SPBMUL3 0x28 /* Transfer Data Length Multiplier Setting Register 3 */
78 #define QSPI_SPBMUL(i) (QSPI_SPBMUL0 + (i) * 4)
80 /* SPCR - Control Register */
81 #define SPCR_SPRIE 0x80 /* Receive Interrupt Enable */
82 #define SPCR_SPE 0x40 /* Function Enable */
83 #define SPCR_SPTIE 0x20 /* Transmit Interrupt Enable */
84 #define SPCR_SPEIE 0x10 /* Error Interrupt Enable */
85 #define SPCR_MSTR 0x08 /* Master/Slave Mode Select */
86 #define SPCR_MODFEN 0x04 /* Mode Fault Error Detection Enable */
88 #define SPCR_TXMD 0x02 /* TX Only Mode (vs. Full Duplex) */
89 #define SPCR_SPMS 0x01 /* 3-wire Mode (vs. 4-wire) */
90 /* QSPI on R-Car M2 only */
91 #define SPCR_WSWAP 0x02 /* Word Swap of read-data for DMAC */
92 #define SPCR_BSWAP 0x01 /* Byte Swap of read-data for DMAC */
94 /* SSLP - Slave Select Polarity Register */
95 #define SSLP_SSL1P 0x02 /* SSL1 Signal Polarity Setting */
96 #define SSLP_SSL0P 0x01 /* SSL0 Signal Polarity Setting */
98 /* SPPCR - Pin Control Register */
99 #define SPPCR_MOIFE 0x20 /* MOSI Idle Value Fixing Enable */
100 #define SPPCR_MOIFV 0x10 /* MOSI Idle Fixed Value */
101 #define SPPCR_SPOM 0x04
102 #define SPPCR_SPLP2 0x02 /* Loopback Mode 2 (non-inverting) */
103 #define SPPCR_SPLP 0x01 /* Loopback Mode (inverting) */
105 #define SPPCR_IO3FV 0x04 /* Single-/Dual-SPI Mode IO3 Output Fixed Value */
106 #define SPPCR_IO2FV 0x04 /* Single-/Dual-SPI Mode IO2 Output Fixed Value */
108 /* SPSR - Status Register */
109 #define SPSR_SPRF 0x80 /* Receive Buffer Full Flag */
110 #define SPSR_TEND 0x40 /* Transmit End */
111 #define SPSR_SPTEF 0x20 /* Transmit Buffer Empty Flag */
112 #define SPSR_PERF 0x08 /* Parity Error Flag */
113 #define SPSR_MODF 0x04 /* Mode Fault Error Flag */
114 #define SPSR_IDLNF 0x02 /* RSPI Idle Flag */
115 #define SPSR_OVRF 0x01 /* Overrun Error Flag (RSPI only) */
117 /* SPSCR - Sequence Control Register */
118 #define SPSCR_SPSLN_MASK 0x07 /* Sequence Length Specification */
120 /* SPSSR - Sequence Status Register */
121 #define SPSSR_SPECM_MASK 0x70 /* Command Error Mask */
122 #define SPSSR_SPCP_MASK 0x07 /* Command Pointer Mask */
124 /* SPDCR - Data Control Register */
125 #define SPDCR_TXDMY 0x80 /* Dummy Data Transmission Enable */
126 #define SPDCR_SPLW1 0x40 /* Access Width Specification (RZ) */
127 #define SPDCR_SPLW0 0x20 /* Access Width Specification (RZ) */
128 #define SPDCR_SPLLWORD (SPDCR_SPLW1 | SPDCR_SPLW0)
129 #define SPDCR_SPLWORD SPDCR_SPLW1
130 #define SPDCR_SPLBYTE SPDCR_SPLW0
131 #define SPDCR_SPLW 0x20 /* Access Width Specification (SH) */
132 #define SPDCR_SPRDTD 0x10 /* Receive Transmit Data Select (SH) */
133 #define SPDCR_SLSEL1 0x08
134 #define SPDCR_SLSEL0 0x04
135 #define SPDCR_SLSEL_MASK 0x0c /* SSL1 Output Select (SH) */
136 #define SPDCR_SPFC1 0x02
137 #define SPDCR_SPFC0 0x01
138 #define SPDCR_SPFC_MASK 0x03 /* Frame Count Setting (1-4) (SH) */
140 /* SPCKD - Clock Delay Register */
141 #define SPCKD_SCKDL_MASK 0x07 /* Clock Delay Setting (1-8) */
143 /* SSLND - Slave Select Negation Delay Register */
144 #define SSLND_SLNDL_MASK 0x07 /* SSL Negation Delay Setting (1-8) */
146 /* SPND - Next-Access Delay Register */
147 #define SPND_SPNDL_MASK 0x07 /* Next-Access Delay Setting (1-8) */
149 /* SPCR2 - Control Register 2 */
150 #define SPCR2_PTE 0x08 /* Parity Self-Test Enable */
151 #define SPCR2_SPIE 0x04 /* Idle Interrupt Enable */
152 #define SPCR2_SPOE 0x02 /* Odd Parity Enable (vs. Even) */
153 #define SPCR2_SPPE 0x01 /* Parity Enable */
155 /* SPCMDn - Command Registers */
156 #define SPCMD_SCKDEN 0x8000 /* Clock Delay Setting Enable */
157 #define SPCMD_SLNDEN 0x4000 /* SSL Negation Delay Setting Enable */
158 #define SPCMD_SPNDEN 0x2000 /* Next-Access Delay Enable */
159 #define SPCMD_LSBF 0x1000 /* LSB First */
160 #define SPCMD_SPB_MASK 0x0f00 /* Data Length Setting */
161 #define SPCMD_SPB_8_TO_16(bit) (((bit - 1) << 8) & SPCMD_SPB_MASK)
162 #define SPCMD_SPB_8BIT 0x0000 /* QSPI only */
163 #define SPCMD_SPB_16BIT 0x0100
164 #define SPCMD_SPB_20BIT 0x0000
165 #define SPCMD_SPB_24BIT 0x0100
166 #define SPCMD_SPB_32BIT 0x0200
167 #define SPCMD_SSLKP 0x0080 /* SSL Signal Level Keeping */
168 #define SPCMD_SPIMOD_MASK 0x0060 /* SPI Operating Mode (QSPI only) */
169 #define SPCMD_SPIMOD1 0x0040
170 #define SPCMD_SPIMOD0 0x0020
171 #define SPCMD_SPIMOD_SINGLE 0
172 #define SPCMD_SPIMOD_DUAL SPCMD_SPIMOD0
173 #define SPCMD_SPIMOD_QUAD SPCMD_SPIMOD1
174 #define SPCMD_SPRW 0x0010 /* SPI Read/Write Access (Dual/Quad) */
175 #define SPCMD_SSLA_MASK 0x0030 /* SSL Assert Signal Setting (RSPI) */
176 #define SPCMD_BRDV_MASK 0x000c /* Bit Rate Division Setting */
177 #define SPCMD_CPOL 0x0002 /* Clock Polarity Setting */
178 #define SPCMD_CPHA 0x0001 /* Clock Phase Setting */
180 /* SPBFCR - Buffer Control Register */
181 #define SPBFCR_TXRST 0x80 /* Transmit Buffer Data Reset */
182 #define SPBFCR_RXRST 0x40 /* Receive Buffer Data Reset */
183 #define SPBFCR_TXTRG_MASK 0x30 /* Transmit Buffer Data Triggering Number */
184 #define SPBFCR_RXTRG_MASK 0x07 /* Receive Buffer Data Triggering Number */
186 #define DUMMY_DATA 0x00
191 struct spi_master *master;
192 wait_queue_head_t wait;
198 const struct spi_ops *ops;
201 struct dma_chan *chan_tx;
202 struct dma_chan *chan_rx;
204 unsigned dma_width_16bit:1;
205 unsigned dma_callbacked:1;
206 unsigned byte_access:1;
209 static void rspi_write8(const struct rspi_data *rspi, u8 data, u16 offset)
211 iowrite8(data, rspi->addr + offset);
214 static void rspi_write16(const struct rspi_data *rspi, u16 data, u16 offset)
216 iowrite16(data, rspi->addr + offset);
219 static void rspi_write32(const struct rspi_data *rspi, u32 data, u16 offset)
221 iowrite32(data, rspi->addr + offset);
224 static u8 rspi_read8(const struct rspi_data *rspi, u16 offset)
226 return ioread8(rspi->addr + offset);
229 static u16 rspi_read16(const struct rspi_data *rspi, u16 offset)
231 return ioread16(rspi->addr + offset);
234 static void rspi_write_data(const struct rspi_data *rspi, u16 data)
236 if (rspi->byte_access)
237 rspi_write8(rspi, data, RSPI_SPDR);
239 rspi_write16(rspi, data, RSPI_SPDR);
242 static u16 rspi_read_data(const struct rspi_data *rspi)
244 if (rspi->byte_access)
245 return rspi_read8(rspi, RSPI_SPDR);
247 return rspi_read16(rspi, RSPI_SPDR);
250 /* optional functions */
252 int (*set_config_register)(struct rspi_data *rspi, int access_size);
253 int (*transfer_one)(struct spi_master *master, struct spi_device *spi,
254 struct spi_transfer *xfer);
259 * functions for RSPI on legacy SH
261 static int rspi_set_config_register(struct rspi_data *rspi, int access_size)
265 /* Sets output mode, MOSI signal, and (optionally) loopback */
266 rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
268 /* Sets transfer bit rate */
269 spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk),
270 2 * rspi->max_speed_hz) - 1;
271 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
273 /* Disable dummy transmission, set 16-bit word access, 1 frame */
274 rspi_write8(rspi, 0, RSPI_SPDCR);
275 rspi->byte_access = 0;
277 /* Sets RSPCK, SSL, next-access delay value */
278 rspi_write8(rspi, 0x00, RSPI_SPCKD);
279 rspi_write8(rspi, 0x00, RSPI_SSLND);
280 rspi_write8(rspi, 0x00, RSPI_SPND);
282 /* Sets parity, interrupt mask */
283 rspi_write8(rspi, 0x00, RSPI_SPCR2);
286 rspi->spcmd |= SPCMD_SPB_8_TO_16(access_size);
287 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
290 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
296 * functions for RSPI on RZ
298 static int rspi_rz_set_config_register(struct rspi_data *rspi, int access_size)
302 /* Sets output mode, MOSI signal, and (optionally) loopback */
303 rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
305 /* Sets transfer bit rate */
306 spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk),
307 2 * rspi->max_speed_hz) - 1;
308 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
310 /* Disable dummy transmission, set byte access */
311 rspi_write8(rspi, SPDCR_SPLBYTE, RSPI_SPDCR);
312 rspi->byte_access = 1;
314 /* Sets RSPCK, SSL, next-access delay value */
315 rspi_write8(rspi, 0x00, RSPI_SPCKD);
316 rspi_write8(rspi, 0x00, RSPI_SSLND);
317 rspi_write8(rspi, 0x00, RSPI_SPND);
320 rspi->spcmd |= SPCMD_SPB_8_TO_16(access_size);
321 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
324 rspi_write8(rspi, SPCR_MSTR, RSPI_SPCR);
332 static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
336 /* Sets output mode, MOSI signal, and (optionally) loopback */
337 rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
339 /* Sets transfer bit rate */
340 spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk), 2 * rspi->max_speed_hz);
341 rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
343 /* Disable dummy transmission, set byte access */
344 rspi_write8(rspi, 0, RSPI_SPDCR);
345 rspi->byte_access = 1;
347 /* Sets RSPCK, SSL, next-access delay value */
348 rspi_write8(rspi, 0x00, RSPI_SPCKD);
349 rspi_write8(rspi, 0x00, RSPI_SSLND);
350 rspi_write8(rspi, 0x00, RSPI_SPND);
352 /* Data Length Setting */
353 if (access_size == 8)
354 rspi->spcmd |= SPCMD_SPB_8BIT;
355 else if (access_size == 16)
356 rspi->spcmd |= SPCMD_SPB_16BIT;
358 rspi->spcmd |= SPCMD_SPB_32BIT;
360 rspi->spcmd |= SPCMD_SCKDEN | SPCMD_SLNDEN | SPCMD_SPNDEN;
362 /* Resets transfer data length */
363 rspi_write32(rspi, 0, QSPI_SPBMUL0);
365 /* Resets transmit and receive buffer */
366 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR);
367 /* Sets buffer to allow normal operation */
368 rspi_write8(rspi, 0x00, QSPI_SPBFCR);
371 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
373 /* Enables SPI function in master mode */
374 rspi_write8(rspi, SPCR_SPE | SPCR_MSTR, RSPI_SPCR);
379 #define set_config_register(spi, n) spi->ops->set_config_register(spi, n)
381 static void rspi_enable_irq(const struct rspi_data *rspi, u8 enable)
383 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | enable, RSPI_SPCR);
386 static void rspi_disable_irq(const struct rspi_data *rspi, u8 disable)
388 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~disable, RSPI_SPCR);
391 static int rspi_wait_for_interrupt(struct rspi_data *rspi, u8 wait_mask,
396 rspi->spsr = rspi_read8(rspi, RSPI_SPSR);
397 if (rspi->spsr & wait_mask)
400 rspi_enable_irq(rspi, enable_bit);
401 ret = wait_event_timeout(rspi->wait, rspi->spsr & wait_mask, HZ);
402 if (ret == 0 && !(rspi->spsr & wait_mask))
408 static inline int rspi_wait_for_tx_empty(struct rspi_data *rspi)
410 return rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE);
413 static inline int rspi_wait_for_rx_full(struct rspi_data *rspi)
415 return rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE);
418 static int rspi_data_out(struct rspi_data *rspi, u8 data)
420 int error = rspi_wait_for_tx_empty(rspi);
422 dev_err(&rspi->master->dev, "transmit timeout\n");
425 rspi_write_data(rspi, data);
429 static int rspi_data_in(struct rspi_data *rspi)
434 error = rspi_wait_for_rx_full(rspi);
436 dev_err(&rspi->master->dev, "receive timeout\n");
439 data = rspi_read_data(rspi);
443 static int rspi_data_out_in(struct rspi_data *rspi, u8 data)
447 ret = rspi_data_out(rspi, data);
451 return rspi_data_in(rspi);
454 static void rspi_dma_complete(void *arg)
456 struct rspi_data *rspi = arg;
458 rspi->dma_callbacked = 1;
459 wake_up_interruptible(&rspi->wait);
462 static int rspi_dma_map_sg(struct scatterlist *sg, const void *buf,
463 unsigned len, struct dma_chan *chan,
464 enum dma_transfer_direction dir)
466 sg_init_table(sg, 1);
467 sg_set_buf(sg, buf, len);
468 sg_dma_len(sg) = len;
469 return dma_map_sg(chan->device->dev, sg, 1, dir);
472 static void rspi_dma_unmap_sg(struct scatterlist *sg, struct dma_chan *chan,
473 enum dma_transfer_direction dir)
475 dma_unmap_sg(chan->device->dev, sg, 1, dir);
478 static void rspi_memory_to_8bit(void *buf, const void *data, unsigned len)
481 const u8 *src = data;
484 *dst++ = (u16)(*src++);
489 static void rspi_memory_from_8bit(void *buf, const void *data, unsigned len)
492 const u16 *src = data;
500 static int rspi_send_dma(struct rspi_data *rspi, struct spi_transfer *t)
502 struct scatterlist sg;
503 const void *buf = NULL;
504 struct dma_async_tx_descriptor *desc;
508 if (rspi->dma_width_16bit) {
511 * If DMAC bus width is 16-bit, the driver allocates a dummy
512 * buffer. And, the driver converts original data into the
513 * DMAC data as the following format:
514 * original data: 1st byte, 2nd byte ...
515 * DMAC data: 1st byte, dummy, 2nd byte, dummy ...
518 tmp = kmalloc(len, GFP_KERNEL);
521 rspi_memory_to_8bit(tmp, t->tx_buf, t->len);
528 if (!rspi_dma_map_sg(&sg, buf, len, rspi->chan_tx, DMA_TO_DEVICE)) {
532 desc = dmaengine_prep_slave_sg(rspi->chan_tx, &sg, 1, DMA_TO_DEVICE,
533 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
540 * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be
541 * called. So, this driver disables the IRQ while DMA transfer.
543 disable_irq(rspi->tx_irq);
545 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_TXMD, RSPI_SPCR);
546 rspi_enable_irq(rspi, SPCR_SPTIE);
547 rspi->dma_callbacked = 0;
549 desc->callback = rspi_dma_complete;
550 desc->callback_param = rspi;
551 dmaengine_submit(desc);
552 dma_async_issue_pending(rspi->chan_tx);
554 ret = wait_event_interruptible_timeout(rspi->wait,
555 rspi->dma_callbacked, HZ);
556 if (ret > 0 && rspi->dma_callbacked)
560 rspi_disable_irq(rspi, SPCR_SPTIE);
562 enable_irq(rspi->tx_irq);
565 rspi_dma_unmap_sg(&sg, rspi->chan_tx, DMA_TO_DEVICE);
567 if (rspi->dma_width_16bit)
573 static void rspi_receive_init(const struct rspi_data *rspi)
577 spsr = rspi_read8(rspi, RSPI_SPSR);
578 if (spsr & SPSR_SPRF)
579 rspi_read_data(rspi); /* dummy read */
580 if (spsr & SPSR_OVRF)
581 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPSR) & ~SPSR_OVRF,
585 static void rspi_rz_receive_init(const struct rspi_data *rspi)
587 rspi_receive_init(rspi);
588 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, RSPI_SPBFCR);
589 rspi_write8(rspi, 0, RSPI_SPBFCR);
592 static void qspi_receive_init(const struct rspi_data *rspi)
596 spsr = rspi_read8(rspi, RSPI_SPSR);
597 if (spsr & SPSR_SPRF)
598 rspi_read_data(rspi); /* dummy read */
599 rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR);
600 rspi_write8(rspi, 0, QSPI_SPBFCR);
603 static int rspi_receive_dma(struct rspi_data *rspi, struct spi_transfer *t)
605 struct scatterlist sg, sg_dummy;
606 void *dummy = NULL, *rx_buf = NULL;
607 struct dma_async_tx_descriptor *desc, *desc_dummy;
611 if (rspi->dma_width_16bit) {
613 * If DMAC bus width is 16-bit, the driver allocates a dummy
614 * buffer. And, finally the driver converts the DMAC data into
615 * actual data as the following format:
616 * DMAC data: 1st byte, dummy, 2nd byte, dummy ...
617 * actual data: 1st byte, 2nd byte ...
620 rx_buf = kmalloc(len, GFP_KERNEL);
628 /* prepare dummy transfer to generate SPI clocks */
629 dummy = kzalloc(len, GFP_KERNEL);
634 if (!rspi_dma_map_sg(&sg_dummy, dummy, len, rspi->chan_tx,
639 desc_dummy = dmaengine_prep_slave_sg(rspi->chan_tx, &sg_dummy, 1,
640 DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
643 goto end_dummy_mapped;
646 /* prepare receive transfer */
647 if (!rspi_dma_map_sg(&sg, rx_buf, len, rspi->chan_rx,
650 goto end_dummy_mapped;
653 desc = dmaengine_prep_slave_sg(rspi->chan_rx, &sg, 1, DMA_FROM_DEVICE,
654 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
660 rspi_receive_init(rspi);
663 * DMAC needs SPTIE, but if SPTIE is set, this IRQ routine will be
664 * called. So, this driver disables the IRQ while DMA transfer.
666 disable_irq(rspi->tx_irq);
667 if (rspi->rx_irq != rspi->tx_irq)
668 disable_irq(rspi->rx_irq);
670 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_TXMD, RSPI_SPCR);
671 rspi_enable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE);
672 rspi->dma_callbacked = 0;
674 desc->callback = rspi_dma_complete;
675 desc->callback_param = rspi;
676 dmaengine_submit(desc);
677 dma_async_issue_pending(rspi->chan_rx);
679 desc_dummy->callback = NULL; /* No callback */
680 dmaengine_submit(desc_dummy);
681 dma_async_issue_pending(rspi->chan_tx);
683 ret = wait_event_interruptible_timeout(rspi->wait,
684 rspi->dma_callbacked, HZ);
685 if (ret > 0 && rspi->dma_callbacked)
689 rspi_disable_irq(rspi, SPCR_SPTIE | SPCR_SPRIE);
691 enable_irq(rspi->tx_irq);
692 if (rspi->rx_irq != rspi->tx_irq)
693 enable_irq(rspi->rx_irq);
696 rspi_dma_unmap_sg(&sg, rspi->chan_rx, DMA_FROM_DEVICE);
698 rspi_dma_unmap_sg(&sg_dummy, rspi->chan_tx, DMA_TO_DEVICE);
700 if (rspi->dma_width_16bit) {
702 rspi_memory_from_8bit(t->rx_buf, rx_buf, t->len);
710 static int rspi_is_dma(const struct rspi_data *rspi, struct spi_transfer *t)
712 if (t->tx_buf && rspi->chan_tx)
714 /* If the module receives data by DMAC, it also needs TX DMAC */
715 if (t->rx_buf && rspi->chan_tx && rspi->chan_rx)
721 static int rspi_transfer_out_in(struct rspi_data *rspi,
722 struct spi_transfer *xfer)
724 int remain = xfer->len, ret;
725 const u8 *tx_buf = xfer->tx_buf;
726 u8 *rx_buf = xfer->rx_buf;
729 spcr = rspi_read8(rspi, RSPI_SPCR);
731 rspi_receive_init(rspi);
736 rspi_write8(rspi, spcr, RSPI_SPCR);
739 data = tx_buf ? *tx_buf++ : DUMMY_DATA;
740 ret = rspi_data_out(rspi, data);
744 ret = rspi_data_in(rspi);
752 /* Wait for the last transmission */
753 rspi_wait_for_tx_empty(rspi);
758 static int rspi_transfer_one(struct spi_master *master, struct spi_device *spi,
759 struct spi_transfer *xfer)
761 struct rspi_data *rspi = spi_master_get_devdata(master);
764 if (!rspi_is_dma(rspi, xfer))
765 return rspi_transfer_out_in(rspi, xfer);
768 ret = rspi_send_dma(rspi, xfer);
773 return rspi_receive_dma(rspi, xfer);
778 static int rspi_rz_transfer_out_in(struct rspi_data *rspi,
779 struct spi_transfer *xfer)
781 int remain = xfer->len, ret;
782 const u8 *tx_buf = xfer->tx_buf;
783 u8 *rx_buf = xfer->rx_buf;
786 rspi_rz_receive_init(rspi);
789 data = tx_buf ? *tx_buf++ : DUMMY_DATA;
790 ret = rspi_data_out_in(rspi, data);
798 /* Wait for the last transmission */
799 rspi_wait_for_tx_empty(rspi);
804 static int rspi_rz_transfer_one(struct spi_master *master,
805 struct spi_device *spi,
806 struct spi_transfer *xfer)
808 struct rspi_data *rspi = spi_master_get_devdata(master);
810 return rspi_rz_transfer_out_in(rspi, xfer);
813 static int qspi_transfer_out_in(struct rspi_data *rspi,
814 struct spi_transfer *xfer)
816 int remain = xfer->len, ret;
817 const u8 *tx_buf = xfer->tx_buf;
818 u8 *rx_buf = xfer->rx_buf;
821 qspi_receive_init(rspi);
824 data = tx_buf ? *tx_buf++ : DUMMY_DATA;
825 ret = rspi_data_out_in(rspi, data);
833 /* Wait for the last transmission */
834 rspi_wait_for_tx_empty(rspi);
839 static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
841 const u8 *buf = xfer->tx_buf;
845 for (i = 0; i < xfer->len; i++) {
846 ret = rspi_data_out(rspi, *buf++);
851 /* Wait for the last transmission */
852 rspi_wait_for_tx_empty(rspi);
857 static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer)
859 u8 *buf = xfer->rx_buf;
863 for (i = 0; i < xfer->len; i++) {
864 ret = rspi_data_in(rspi);
873 static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi,
874 struct spi_transfer *xfer)
876 struct rspi_data *rspi = spi_master_get_devdata(master);
878 if (spi->mode & SPI_LOOP) {
879 return qspi_transfer_out_in(rspi, xfer);
880 } else if (xfer->tx_buf && xfer->tx_nbits > SPI_NBITS_SINGLE) {
881 /* Quad or Dual SPI Write */
882 return qspi_transfer_out(rspi, xfer);
883 } else if (xfer->rx_buf && xfer->rx_nbits > SPI_NBITS_SINGLE) {
884 /* Quad or Dual SPI Read */
885 return qspi_transfer_in(rspi, xfer);
887 /* Single SPI Transfer */
888 return qspi_transfer_out_in(rspi, xfer);
892 static int rspi_setup(struct spi_device *spi)
894 struct rspi_data *rspi = spi_master_get_devdata(spi->master);
896 rspi->max_speed_hz = spi->max_speed_hz;
898 rspi->spcmd = SPCMD_SSLKP;
899 if (spi->mode & SPI_CPOL)
900 rspi->spcmd |= SPCMD_CPOL;
901 if (spi->mode & SPI_CPHA)
902 rspi->spcmd |= SPCMD_CPHA;
904 /* CMOS output mode and MOSI signal from previous transfer */
906 if (spi->mode & SPI_LOOP)
907 rspi->sppcr |= SPPCR_SPLP;
909 set_config_register(rspi, 8);
914 static u16 qspi_transfer_mode(const struct spi_transfer *xfer)
917 switch (xfer->tx_nbits) {
919 return SPCMD_SPIMOD_QUAD;
921 return SPCMD_SPIMOD_DUAL;
926 switch (xfer->rx_nbits) {
928 return SPCMD_SPIMOD_QUAD | SPCMD_SPRW;
930 return SPCMD_SPIMOD_DUAL | SPCMD_SPRW;
938 static int qspi_setup_sequencer(struct rspi_data *rspi,
939 const struct spi_message *msg)
941 const struct spi_transfer *xfer;
942 unsigned int i = 0, len = 0;
943 u16 current_mode = 0xffff, mode;
945 list_for_each_entry(xfer, &msg->transfers, transfer_list) {
946 mode = qspi_transfer_mode(xfer);
947 if (mode == current_mode) {
952 /* Transfer mode change */
954 /* Set transfer data length of previous transfer */
955 rspi_write32(rspi, len, QSPI_SPBMUL(i - 1));
958 if (i >= QSPI_NUM_SPCMD) {
959 dev_err(&msg->spi->dev,
960 "Too many different transfer modes");
964 /* Program transfer mode for this transfer */
965 rspi_write16(rspi, rspi->spcmd | mode, RSPI_SPCMD(i));
971 /* Set final transfer data length and sequence length */
972 rspi_write32(rspi, len, QSPI_SPBMUL(i - 1));
973 rspi_write8(rspi, i - 1, RSPI_SPSCR);
979 static int rspi_prepare_message(struct spi_master *master,
980 struct spi_message *msg)
982 struct rspi_data *rspi = spi_master_get_devdata(master);
986 (SPI_TX_DUAL | SPI_TX_QUAD | SPI_RX_DUAL | SPI_RX_QUAD)) {
987 /* Setup sequencer for messages with multiple transfer modes */
988 ret = qspi_setup_sequencer(rspi, msg);
993 /* Enable SPI function in master mode */
994 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) | SPCR_SPE, RSPI_SPCR);
998 static int rspi_unprepare_message(struct spi_master *master,
999 struct spi_message *msg)
1001 struct rspi_data *rspi = spi_master_get_devdata(master);
1003 /* Disable SPI function */
1004 rspi_write8(rspi, rspi_read8(rspi, RSPI_SPCR) & ~SPCR_SPE, RSPI_SPCR);
1006 /* Reset sequencer for Single SPI Transfers */
1007 rspi_write16(rspi, rspi->spcmd, RSPI_SPCMD0);
1008 rspi_write8(rspi, 0, RSPI_SPSCR);
1012 static irqreturn_t rspi_irq_mux(int irq, void *_sr)
1014 struct rspi_data *rspi = _sr;
1016 irqreturn_t ret = IRQ_NONE;
1019 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
1020 if (spsr & SPSR_SPRF)
1021 disable_irq |= SPCR_SPRIE;
1022 if (spsr & SPSR_SPTEF)
1023 disable_irq |= SPCR_SPTIE;
1027 rspi_disable_irq(rspi, disable_irq);
1028 wake_up(&rspi->wait);
1034 static irqreturn_t rspi_irq_rx(int irq, void *_sr)
1036 struct rspi_data *rspi = _sr;
1039 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
1040 if (spsr & SPSR_SPRF) {
1041 rspi_disable_irq(rspi, SPCR_SPRIE);
1042 wake_up(&rspi->wait);
1049 static irqreturn_t rspi_irq_tx(int irq, void *_sr)
1051 struct rspi_data *rspi = _sr;
1054 rspi->spsr = spsr = rspi_read8(rspi, RSPI_SPSR);
1055 if (spsr & SPSR_SPTEF) {
1056 rspi_disable_irq(rspi, SPCR_SPTIE);
1057 wake_up(&rspi->wait);
1064 static int rspi_request_dma(struct rspi_data *rspi,
1065 struct platform_device *pdev)
1067 const struct rspi_plat_data *rspi_pd = dev_get_platdata(&pdev->dev);
1068 struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1069 dma_cap_mask_t mask;
1070 struct dma_slave_config cfg;
1073 if (!res || !rspi_pd)
1074 return 0; /* The driver assumes no error. */
1076 rspi->dma_width_16bit = rspi_pd->dma_width_16bit;
1078 /* If the module receives data by DMAC, it also needs TX DMAC */
1079 if (rspi_pd->dma_rx_id && rspi_pd->dma_tx_id) {
1081 dma_cap_set(DMA_SLAVE, mask);
1082 rspi->chan_rx = dma_request_channel(mask, shdma_chan_filter,
1083 (void *)rspi_pd->dma_rx_id);
1084 if (rspi->chan_rx) {
1085 cfg.slave_id = rspi_pd->dma_rx_id;
1086 cfg.direction = DMA_DEV_TO_MEM;
1088 cfg.src_addr = res->start + RSPI_SPDR;
1089 ret = dmaengine_slave_config(rspi->chan_rx, &cfg);
1091 dev_info(&pdev->dev, "Use DMA when rx.\n");
1096 if (rspi_pd->dma_tx_id) {
1098 dma_cap_set(DMA_SLAVE, mask);
1099 rspi->chan_tx = dma_request_channel(mask, shdma_chan_filter,
1100 (void *)rspi_pd->dma_tx_id);
1101 if (rspi->chan_tx) {
1102 cfg.slave_id = rspi_pd->dma_tx_id;
1103 cfg.direction = DMA_MEM_TO_DEV;
1104 cfg.dst_addr = res->start + RSPI_SPDR;
1106 ret = dmaengine_slave_config(rspi->chan_tx, &cfg);
1108 dev_info(&pdev->dev, "Use DMA when tx\n");
1117 static void rspi_release_dma(struct rspi_data *rspi)
1120 dma_release_channel(rspi->chan_tx);
1122 dma_release_channel(rspi->chan_rx);
1125 static int rspi_remove(struct platform_device *pdev)
1127 struct rspi_data *rspi = platform_get_drvdata(pdev);
1129 rspi_release_dma(rspi);
1130 pm_runtime_disable(&pdev->dev);
1135 static const struct spi_ops rspi_ops = {
1136 .set_config_register = rspi_set_config_register,
1137 .transfer_one = rspi_transfer_one,
1138 .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
1141 static const struct spi_ops rspi_rz_ops = {
1142 .set_config_register = rspi_rz_set_config_register,
1143 .transfer_one = rspi_rz_transfer_one,
1144 .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP,
1147 static const struct spi_ops qspi_ops = {
1148 .set_config_register = qspi_set_config_register,
1149 .transfer_one = qspi_transfer_one,
1150 .mode_bits = SPI_CPHA | SPI_CPOL | SPI_LOOP |
1151 SPI_TX_DUAL | SPI_TX_QUAD |
1152 SPI_RX_DUAL | SPI_RX_QUAD,
1156 static const struct of_device_id rspi_of_match[] = {
1157 /* RSPI on legacy SH */
1158 { .compatible = "renesas,rspi", .data = &rspi_ops },
1159 /* RSPI on RZ/A1H */
1160 { .compatible = "renesas,rspi-rz", .data = &rspi_rz_ops },
1161 /* QSPI on R-Car Gen2 */
1162 { .compatible = "renesas,qspi", .data = &qspi_ops },
1166 MODULE_DEVICE_TABLE(of, rspi_of_match);
1168 static int rspi_parse_dt(struct device *dev, struct spi_master *master)
1173 /* Parse DT properties */
1174 error = of_property_read_u32(dev->of_node, "num-cs", &num_cs);
1176 dev_err(dev, "of_property_read_u32 num-cs failed %d\n", error);
1180 master->num_chipselect = num_cs;
1184 #define rspi_of_match NULL
1185 static inline int rspi_parse_dt(struct device *dev, struct spi_master *master)
1189 #endif /* CONFIG_OF */
1191 static int rspi_request_irq(struct device *dev, unsigned int irq,
1192 irq_handler_t handler, const char *suffix,
1195 const char *base = dev_name(dev);
1196 size_t len = strlen(base) + strlen(suffix) + 2;
1197 char *name = devm_kzalloc(dev, len, GFP_KERNEL);
1200 snprintf(name, len, "%s:%s", base, suffix);
1201 return devm_request_irq(dev, irq, handler, 0, name, dev_id);
1204 static int rspi_probe(struct platform_device *pdev)
1206 struct resource *res;
1207 struct spi_master *master;
1208 struct rspi_data *rspi;
1210 const struct of_device_id *of_id;
1211 const struct rspi_plat_data *rspi_pd;
1212 const struct spi_ops *ops;
1214 master = spi_alloc_master(&pdev->dev, sizeof(struct rspi_data));
1215 if (master == NULL) {
1216 dev_err(&pdev->dev, "spi_alloc_master error.\n");
1220 of_id = of_match_device(rspi_of_match, &pdev->dev);
1223 ret = rspi_parse_dt(&pdev->dev, master);
1227 ops = (struct spi_ops *)pdev->id_entry->driver_data;
1228 rspi_pd = dev_get_platdata(&pdev->dev);
1229 if (rspi_pd && rspi_pd->num_chipselect)
1230 master->num_chipselect = rspi_pd->num_chipselect;
1232 master->num_chipselect = 2; /* default */
1235 /* ops parameter check */
1236 if (!ops->set_config_register) {
1237 dev_err(&pdev->dev, "there is no set_config_register\n");
1242 rspi = spi_master_get_devdata(master);
1243 platform_set_drvdata(pdev, rspi);
1245 rspi->master = master;
1247 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1248 rspi->addr = devm_ioremap_resource(&pdev->dev, res);
1249 if (IS_ERR(rspi->addr)) {
1250 ret = PTR_ERR(rspi->addr);
1254 rspi->clk = devm_clk_get(&pdev->dev, NULL);
1255 if (IS_ERR(rspi->clk)) {
1256 dev_err(&pdev->dev, "cannot get clock\n");
1257 ret = PTR_ERR(rspi->clk);
1261 pm_runtime_enable(&pdev->dev);
1263 init_waitqueue_head(&rspi->wait);
1265 master->bus_num = pdev->id;
1266 master->setup = rspi_setup;
1267 master->auto_runtime_pm = true;
1268 master->transfer_one = ops->transfer_one;
1269 master->prepare_message = rspi_prepare_message;
1270 master->unprepare_message = rspi_unprepare_message;
1271 master->mode_bits = ops->mode_bits;
1272 master->dev.of_node = pdev->dev.of_node;
1274 ret = platform_get_irq_byname(pdev, "rx");
1276 ret = platform_get_irq_byname(pdev, "mux");
1278 ret = platform_get_irq(pdev, 0);
1280 rspi->rx_irq = rspi->tx_irq = ret;
1283 ret = platform_get_irq_byname(pdev, "tx");
1288 dev_err(&pdev->dev, "platform_get_irq error\n");
1292 if (rspi->rx_irq == rspi->tx_irq) {
1293 /* Single multiplexed interrupt */
1294 ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_mux,
1297 /* Multi-interrupt mode, only SPRI and SPTI are used */
1298 ret = rspi_request_irq(&pdev->dev, rspi->rx_irq, rspi_irq_rx,
1301 ret = rspi_request_irq(&pdev->dev, rspi->tx_irq,
1302 rspi_irq_tx, "tx", rspi);
1305 dev_err(&pdev->dev, "request_irq error\n");
1309 ret = rspi_request_dma(rspi, pdev);
1311 dev_err(&pdev->dev, "rspi_request_dma failed.\n");
1315 ret = devm_spi_register_master(&pdev->dev, master);
1317 dev_err(&pdev->dev, "spi_register_master error.\n");
1321 dev_info(&pdev->dev, "probed\n");
1326 rspi_release_dma(rspi);
1328 pm_runtime_disable(&pdev->dev);
1330 spi_master_put(master);
1335 static struct platform_device_id spi_driver_ids[] = {
1336 { "rspi", (kernel_ulong_t)&rspi_ops },
1337 { "rspi-rz", (kernel_ulong_t)&rspi_rz_ops },
1338 { "qspi", (kernel_ulong_t)&qspi_ops },
1342 MODULE_DEVICE_TABLE(platform, spi_driver_ids);
1344 static struct platform_driver rspi_driver = {
1345 .probe = rspi_probe,
1346 .remove = rspi_remove,
1347 .id_table = spi_driver_ids,
1349 .name = "renesas_spi",
1350 .owner = THIS_MODULE,
1351 .of_match_table = of_match_ptr(rspi_of_match),
1354 module_platform_driver(rspi_driver);
1356 MODULE_DESCRIPTION("Renesas RSPI bus driver");
1357 MODULE_LICENSE("GPL v2");
1358 MODULE_AUTHOR("Yoshihiro Shimoda");
1359 MODULE_ALIAS("platform:rspi");